<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>ID属性</title>
    <style>
        #myHeader {
            background-color: lightblue;
            color: black;
            padding: 40px;
            text-align: center;
        }
    </style>
</head>
<body>
<h1 id="myHeader">ID属性</h1>
</body>
</html>